My problem states:

Determine the domain of the relation, and determine whether the relation describes y as a function of x:

y=|x|

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- Mar 28th 2012, 12:12 PMKibbygirlDomain of the relation
My problem states:

Determine the domain of the relation, and determine whether the relation describes y as a function of x:

y=|x| - Mar 28th 2012, 12:23 PMPlatoRe: Domain of the relation
A relation is a set of ordered pairs.

In this case: $\displaystyle \{(x,|x|)\}$.

The domain is the set of first terms. What is this set of values?

If no two pairs can have the same first term then the relation is a function on the domain.

Is this relation a function? - Mar 28th 2012, 06:30 PMKibbygirlRe: Domain of the relation
Would the domain just be x then? I'm not understanding what the domain would be when it is just listing a variable - though does the bars mean "absolute"?

- Mar 29th 2012, 02:07 AMearbothRe: Domain of the relation